Fire detector



FIG. 1 is a perspective view of the top, front and left side of a firedetector showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a rear view.

The broken lines depict unclaimed environmental subject matter.

The ornamental design for a fire detector, as shown and described.